diff --git a/tccelf.c b/tccelf.c
index 3ddbe48c..8f1d9642 100644
--- a/tccelf.c
+++ b/tccelf.c
@@ -2504,6 +2504,7 @@ static int tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr,
 #elif defined TCC_TARGET_ARM
     ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM;
 #elif defined TCC_TARGET_RISCV64
+    /* XXX should be configurable */
     ehdr.e_flags = EF_RISCV_FLOAT_ABI_DOUBLE;
 #endif